[v1] virtio-net: live-TAP local migration

[RFC 0/7] virtio-net: live-TAP local migration

Vladimir Sementsov-Ogievskiy posted 7 patches 2 months, 3 weeks ago

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hw/net/virtio-net.c            | 100 +++++++++-
include/hw/virtio/virtio-net.h |   2 +
include/net/tap.h              |   4 +
migration/options.c            |   7 +
migration/options.h            |   1 +
net/tap.c                      | 226 ++++++++++++++++-----
net/trace-events               |   7 +
python/qemu/machine/machine.py |  37 ++--
python/tap-migration-stand.py  | 348 +++++++++++++++++++++++++++++++++
qapi/migration.json            |   9 +-
qapi/net.json                  |  12 +-
11 files changed, 681 insertions(+), 72 deletions(-)
create mode 100755 python/tap-migration-stand.py

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[RFC 0/7] virtio-net: live-TAP local migration

Posted by Vladimir Sementsov-Ogievskiy 2 months, 3 weeks ago

Hi all!

That's a kind of alternative to
[RFC V2 0/8] Live update: tap and vhost
https://patchew.org/QEMU/1752777568-236368-1-git-send-email-steven.sistare@oracle.com/

Instead of using CPR with additional stage and channel to pass FDs,
we just pass everything we need (including FDs) through main
migration channel (of-course, it should be unix socket). So,
it's similar to live-backend vhost-user-blk migration which I propose in
[PATCH 00/33] vhost-user-blk: live-backend local migration
https://patchew.org/QEMU/20250813164856.950363-1-vsementsov@yandex-team.ru/

The series is based on
[PATCH 00/33] vhost-user-blk: live-backend local migration
and
[PATCH v2 00/20] TAP initialization refactoring

The series is also pushed to tag up-tap-fd-migration-v1 here:
https://gitlab.com/vsementsov/qemu/-/tree/up-tap-fd-migration-v1?ref_type=tags

The series is working draft, so marked as RFC. Next steps would be
implementing a test, and smarter migration of vhostnet
(without reinitialization of vhost).

The last patch provides a kind of stand to test these series, and it
also can help with testing "[RFC V2 0/8] Live update: tap and vhost"

Based-on: <20250823160323.20811-1-vsementsov@yandex-team.ru>
Based-on: <20250823160323.20811-1-vsementsov@yandex-team.ru>

Vladimir Sementsov-Ogievskiy (7):
  net/tap: add some trace points
  net/tap: keep exit notifier only when downscript set
  qapi: add interface for local TAP migration
  net/tap: implement interfaces for local migration
  virtio-net: support local tap migration
  net/tap: experimental support for vhost in local tap migration
  RFC: add python/tap-migration-stand.py

 hw/net/virtio-net.c            | 100 +++++++++-
 include/hw/virtio/virtio-net.h |   2 +
 include/net/tap.h              |   4 +
 migration/options.c            |   7 +
 migration/options.h            |   1 +
 net/tap.c                      | 226 ++++++++++++++++-----
 net/trace-events               |   7 +
 python/qemu/machine/machine.py |  37 ++--
 python/tap-migration-stand.py  | 348 +++++++++++++++++++++++++++++++++
 qapi/migration.json            |   9 +-
 qapi/net.json                  |  12 +-
 11 files changed, 681 insertions(+), 72 deletions(-)
 create mode 100755 python/tap-migration-stand.py

-- 
2.48.1